412 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



Wanneria ? gracilc, new genus and new species (continued) : page 



19. Central part of the cephalon illustrating the glabella and 



palpebral lobes. Natural size. U. S. National Museum, Cata- 

 logue No. 56803^. 



20. A cephalon slightly distorted by lateral compression. X i-5- 



U. S. National Museum, Catalogue No. 56803^. 



The specimens illustrated by figs. 17-20 are from locality 

 (60&), the sandstones at Vermilion Pass, Alberta. 



21. A cast in a fine quartzitic sandstone from California of a very 



perfect cephalon showing the heavy marginal border and the 

 slender glabella. Natural size. Locality (14/'), near Resting 

 Springs, Inyo County, California. U. S. National Museum, 

 Catalogue No. 568040. 



22. A cephalon that appears to have the adult characters of the 



species. X i-S- U. S. National Museum, Catalogue No. 

 56805a. 



23. Central portion of the cephalon of a small specimen in which 



the genal angles are rounded inward. X 2. U. S. National 

 Museum, Catalogue No. 56805^. 



24. A minute cephalon exclusive of spines. X 10. U. S. National 



Museum, Catalogue No. 568046. 



Figures 22-24 represent specimens from locality {iv'), a fine 

 arenaceous shale at Barrel Spring, Silver Peak Quadrangle, 

 Esmeralda County, Nevada. 



DESCRIPTION OF PLATE 39 



Olenellus lapwortJii Peach 331 



Fig. I. Dorsal shield. X 2. Specimen in Royal Scottish Museum, Edin- 

 burgh, Scotland, Catalogue No. M4080C?. Cast in U. S. Na- 

 tional Museum, Catalogue No. 56830a. 



Figure i is redrawn from the specimen figured by Peach, 

 1894, Pl- 29. fig. 3- 



2. Cephalon. X i-5. Specimen in Royal Scottish Museum, Edin- 



burgh, Scotland, Catalogue No. M495f. Cast in U. S. Na- 

 tional Museum, Catalogue No. 568306. 



3. Cephalon. X 2. U. S. National Museum, Catalogue No. 56831a. 



4. A small cephalon. Specimen in Royal Scottish Museum, Edin- 



burgh, Scotland, Catalogue No. M26ii^. Cast in U. S. Na- 

 tional Museum, Catalogue No. 56830c. 



5. Imperfect dorsal shield, 6.25 mm. in length. X 3- Specimen in 



Royal Scottish Museum, Edinburgh, Scotland, Catalogue No. 

 M4i98rf. Cast in U. S. National Museum, Catalogue No. 

 56830^. 



